Giardia lamblia is a common cause of infectious diarrhea in patients with antibody deficiencies. Eradication may be difficult and patients may develop chronic diarrhea and malabsorption. Metronidazole is the principle antimicrobial used to treat this infection. Giardia has been reported in the following antibody deficiency syndromes:

X-Linked Agammaglobulinemia


X-Linked Hyper IgM

AR Hyper IgM Syndrome